Question

Check whether x = -3 is the root of the quadratic equation
x2 + 4 = 13 ans​

Answer 1

$x = - 3 \\ {x}^{2} + 4x = 13 \\ ( { - 3)}^{2} + 4( - 3) = 13 \\ 9 - 12 = 13 \\ - 3 ≠ 13$

So -3 is not the root of x² + 4x = 13